↑People living in what is now South Dakota in 1860 were enumerated in (1) the "unorganized" part of the Dakota Territory census east of the Missouri River, together with several locales on the west shore of the Missouri River (at Dirtville, Fort Lookout, Fort Pierre, Old Cedar Fort, Old Fort George )and (2) Ft. Randall (now Gregory County) was enumerated as part of the "unorganized county" of the Nebraska Territory census west of the Missouri River.

↑No white residents are believed to have existed in 1850 South Dakota. Residents of what is now South Dakota, theoretically would have been included as part of the 1850 census of Minnesota Territory." See Thorndale and Dollarhide, pages 114, 170, and 259.

↑No white residents are believed to have existed in 1840 South Dakota. Residents of what is now South Dakota, theoretically would have been included as part of the 1840 census of Iowa Territory in then "Clayton County." See Thorndale and Dollarhide, pages 114, 170, and 259.

↑Only one resident of Clayton County (the county that theoretically included North and South Dakota) is listed as a veteran pensioner, John Lepper, age 79. He most likely lived in present-day northwestern Iowa, or southern Minnesota. See Thorndale and Dollarhide, pages 114, 170, and 259.

↑No white residents are believed to have existed in 1836 South Dakota. Residents of what is now South Dakota, theoretically would have been included as part of the 1936 Wisconsin Territory. Apparently the Wisconsin governor chose to ignore them, if any, and did not ask a sheriff to conduct a census in what is now South Dakota. See Reuben Gold Thwaites, "The Territorial Census for 1836" in Collections of the State Historical Society of Wisconsin 13: 248-49 (Madison, Wis.: Democrate Printing, 1895)[FHL Film 1293922 item 2].